St. Landry Parish Water Quality

Name: St. Landry Parish Water Quality Data (2026)
Creator: PurityMap
License: https://creativecommons.org/licenses/by/4.0/

St. Landry Parish, Louisiana: one city report built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my system Open on the map Private wells in St. Landry Parish

Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

LithiumCITY OF OPELOUSAS WATER SYSTEM10 µg/L EPA health reference level (screening, not a legal limit) · US EPA29.8 µg/L

CITY OF OPELOUSAS WATER SYSTEM29.8 µg/LSample date: 2025-08-11 to 2025-12-05

Lead (90th percentile)CITY OF OPELOUSAS WATER SYSTEM15 µg/L federal action level · US EPA1 µg/L

CITY OF OPELOUSAS WATER SYSTEM1 µg/LMonitoring period: 2024–2026 (still open)

29 PFAS tested, none detected in this systemShow

Tested in this system: CITY OF OPELOUSAS WATER SYSTEM

11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
Perfluoro-3-methoxypropanoic acid (PFMPA)
Perfluoro-4-methoxybutanoic acid (PFMBA)
Perfluorobutanesulfonic acid (PFBS)
Perfluorobutanoic acid (PFBA)
Perfluorodecanoic acid (PFDA)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluoroheptanoic acid (PFHpA)
Perfluorohexanesulfonic acid (PFHxS)
Perfluorohexanoic acid (PFHxA)
Perfluorononanoic acid (PFNA)
Perfluorooctanesulfonic acid (PFOS)
Perfluorooctanoic acid (PFOA)
Perfluoropentanesulfonic acid (PFPeS)
Perfluoropentanoic acid (PFPeA)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)

1 city

Cities ranked by the records

1
OpelousasCITY OF OPELOUSAS WATER SYSTEM
No PFAS detectedLead below action level
Open city report →

Showing 1 of 1 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in St. Landry ParishPFAS detected in 0 of 1 city; none had a sample above a 2024 EPA limit

4.0 ng/L federal MCL · PFOS, ng/LPFAS in Louisiana

Lead

0of 1 city above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in Louisiana

Who supplies the county

Largest water systems

OpelousasCITY OF OPELOUSAS WATER SYSTEM · LA1097010
20,388 served

Questions

Frequently asked

How does St. Landry Parish tap water compare across cities?

PurityMap ranks 1 city in St. Landry Parish by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Opelousas's main water system: CITY OF OPELOUSAS WATER SYSTEM · PWSID LA1097010 · Purity Score 91 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many St. Landry Parish cities had a PFAS sample above a 2024 EPA limit?

None of the 1 St. Landry Parish city report had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 0.

Is there lead in St. Landry Parish tap water?

Utilities report lead as a 90th-percentile result from home taps. 1 of 1 St. Landry Parish cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

Next step

Follow St. Landry Parish's water

Get an email when a city record in the county changes.

Find my water

FOLLOW THIS COUNTY

Record changes only

We email when places in St. Landry Parish get new results. Unsubscribe any time.

Follow St. Landry Parish's water →